Bump actions/checkout and add PHP 8.3

[williamdes]

• Bump actions/checkout
• Add PHP 8.3

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +3.74% 🎉

Comparison is base (70b63fa) 69.33% compared to head (b7cd281) 73.07%.
Report is 6 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #642      +/-   ##
==========================================
+ Coverage   69.33%   73.07%   +3.74%     
==========================================
  Files         128      127       -1     
  Lines       27022    21875    -5147     
==========================================
- Hits        18735    15986    -2749     
+ Misses       8287     5889    -2398     

Flag	Coverage Δ
php-5.3-ubuntu-latest	?
php-5.4-ubuntu-latest	?
php-5.5-ubuntu-latest	?
php-5.6-ubuntu-latest	?
php-7.0-ubuntu-latest	?
php-7.1-ubuntu-latest	73.07% <100.00%> (+<0.01%)	⬆️
php-7.2-ubuntu-latest	72.95% <100.00%> (+<0.01%)	⬆️
php-7.3-ubuntu-latest	72.94% <100.00%> (+0.01%)	⬆️
php-7.4-ubuntu-latest	?
php-8.0-ubuntu-latest	?
php-8.1-ubuntu-latest	?
php-8.2-ubuntu-latest	?
php-nightly-ubuntu-latest	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
include/barcodes/qrcode.php	64.05% <100.00%> (+7.30%)	⬆️
include/tcpdf_fonts.php	44.00% <100.00%> (+0.78%)	⬆️
include/tcpdf_static.php	53.10% <100.00%> (+4.53%)	⬆️
tcpdf.php	71.86% <100.00%> (+3.96%)	⬆️

... and 78 files with indirect coverage changes

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[williamdes]

Done: #643